<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>盒子模型</title>
<style type="text/css">
div {
	width:100px;
	height:100px;
	background:red;
	border:2px black solid;
	margin:10px 20px 30px 40px;
	float:left;

}
.box1 {
	width:100px;
	height:100px;
	background:blue;
	float:left;
}
.bigbox{width:300px; height:300px; border:black 2px solid; float:left;}
</style>
</head>

<body>
<div class="bigbox">
<div></div>
<div class="box1"></div>
</div>
</body>
</html>
